Question about Cars & Trucks
How have you determined that #8 is not firing? Normally if you have a coolant leak into a cylinder the spart plug from that cylinder will have white deposits from the burned anitfreeze. Check to make sure that you have spark on that cylinder. If not, the new wires or cap you installed might have a problem or not be seated fully.
Posted on Dec 02, 2014
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Posted on Jan 02, 2017
When you say the #8 plug is black it tells me that you may have a broken piston ring that damaged the #8 cylinder wall to the point where oil is coming up and fouling the plug, along with NO compression, or you may have bad valve seals or a bent valve. A compression test would be the best way to go now, and testers are not expensive, you can go to an auto parts store where they will rent you a compression tester. I am only guessing, and you may have to go into the engine, with a possible rebuild or replacement forthcoming. GOOD LUCK FRIEND.
Posted on Nov 28, 2014
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